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Production of ultra-fine crystal hot-rolled ribbed reinforcing rob

A technology of hot-rolled ribbed steel bar and manufacturing method, applied in metal rolling, manufacturing tools, metal rolling and other directions, can solve the problems of unreachable tensile strength, difficult to achieve, difficult to control, etc., and achieve production cost The effect of reducing and promoting the ferrite phase deformation nucleus and satisfying the welding performance

Inactive Publication Date: 2006-03-15
ANYANG IRON & STEEL GRP
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Problems solved by technology

However, the shortcomings of its research on ultra-fine-grained steel bars are that the research has strict requirements on its deformation temperature, deformation amount, deformation rate, and cooling rate after deformation, which is relatively easy to control for laboratories, but for industrialized large-scale In terms of production, it will be very difficult to control, and it is not easy to achieve
And according to the results of mechanical properties, its performance is only the yield strength of 400Mpa, and the tensile strength is far from the requirements of HRB400 steel bars.

Method used

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Embodiment

[0018] Adopt the method of the present invention to produce ultra-fine-grained reinforced steel technological process: 100 ton converter (electric furnace)——LF refining furnace——150mm continuous casting billet——walking beam type heating furnace—high speed twist-free rolling mill——Stai The Holmore line controls the cooling line. The chemical composition (weight %) of the steel is: C: 0.20%, Si: 0.32%, Mn: 1.49%, Nb: 0.022%. Rolling includes two parts: low temperature controlled rolling and post-rolling controlled cooling. Rolling heating temperature: 1030°C, rolling start temperature: 950-980°C, sizing inlet temperature: 860-880°C; spinning temperature 860-890°C; rolling specification φ8mm, rolling pass 26 passes. After rolling, air cooling is used at the entrance section of the Stelmo line to make the steel undergo rapid phase transformation. The cooling rate is 4.5°C / S. After reaching the phase transformation temperature point, it is then air-cooled, and coils are collected a...

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Abstract

A technology for thermally rolling the superfine-crystal coiled ribbed steel bar used as building material includes such steps as controlled rolling by heating to 980-1100 Deg C., beginning to roll at 930-980 Deg C. and discharging at 860-890 Deg C. and controlled air cooling. Said ribbed steel bar contains C (0.17-0.25 Wt%), Si (0.25-0.80), Mn (1.2-1.6), Nb (0.01-0.025), P (0-0.04), S (0-0.04) and Fe (rest).

Description

technical field [0001] The invention relates to a method for producing hot-rolled ribbed steel wire rod with ultra-fine grain (4-6 μm) above 400Mpa in large-scale industrial production, and belongs to the field of low-alloy steel for construction. Background technique [0002] Grain refinement is one of the most effective ways to improve the strength and toughness of steel materials. On-line control and formation of ultra-fine structures has always been the dream goal of material science and technology workers. The future development direction of steel materials is based on high cleanliness and high uniformity. and ultrafine tissue as the target. In the literature Vol.36.No.8August.2001, Yang Zhongmin and others published the paper "Research on Ultra-fine Grain Critical Austenite Controlled Rolling Process of Ordinary Carbon Steel", through the simulation experiment on the Gleeble-2000 thermal deformation simulator, The effect of process parameters on low-carbon steel Q235 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/18B21B45/02C22C38/12
Inventor 王子亮李利剑李子林赵自义韦弦范银平曹树卫马志军
Owner ANYANG IRON & STEEL GRP
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